TRISTAN DA CUNHA 1999 (MNH) 20P QUEEN MOTHER SHEET, UNISSUED FORMAT
20p Queen Mother's Century plate 1A–1A–1A–1A sheet of 50 stamps iin unofficial format from an unannounced limited promotional printing. All sheets were believed to have been split to fulfill a promotional campaign, but a handful have survived intact. Extremely scarce. Folded horizontally along perfs otherwise fine. Mint never hinged. SG657; SC638
Note: the officially issued stamps exist in sheets comprising two panes of 25 stamps separated by a gutter with plates 1A x 4 in the top margin and plates 1B x 4 in the bottom margin
